fix(@angular/cli): avoid defaulting base-href to an empty string

[clydin]

Fixes #9401
Fixes #9297

[sbologescu]

I applied the fix for 9410 manually on my local, and while the behavior improved so that the browser refreshes the proper route on code changes, I noticed that my fontawesome path is still incorrect causing the icons on the page to be broken after a refresh.
For example, navigating from project root to a route like https://localhost:4200/[some_route] will cause fontawesome to be loaded correctly from the basehref (https://localhost:4200/fontawesome[hash]).
However, if you refresh the above route (or change code to cause a refresh), the browser will incorrectly try to retrieve fontawesome from https://localhost:4200/[some_route]/fontawesome[hash]

Thank you and regards,
Seb

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